Bimatara, Ian (2016) Prediksi Performance Semi-Free Piston Diesel Engine Tipe Dua Langkah Berpiston Ganda Berlawanan Arah. Undergraduate thesis, Institut Technology Sepuluh Nopember.
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Abstract
Desain semi-free piston diesel engine tipe dua langkah berpiston
ganda berlawanan arah telab berbasil dilakukao. Sebelum dibanguo
maoufaktur mesinnya maka perlu diprediksi performanya. Prediksi
dilakukao meogguoakan metode simulasi. Metode ioi dianggap paling
efektif kareoa tanpa dilakukao membanguo mesin terlebih dahulu.
Pemodelan dan simulasi dilakukao deogan meogguoakan software
atau aplikasi. Pemodelan simulasi meocakup seluruh bagian mesin
yakni intake system, block dan injection system, lalu exhaust system.
Prediksi performa mesin dilakukao berdasarkan variasi kecepatan dan
setiap kecepatan dilakukao pembebanan 20"/o, 40"/o, 60%, 80%, I 00%,
dan 120%. Validasi dilaksanakan dengan melakukao desain eogine
konvensional tanpa ada modifikasi formula pada kerugian gesek.
Simulasi meoghasilkan karakteristik performa mesin seperti, torsi,
daya, bsfc, bmep, dan karakteristik proses pembakaran seperti heat
release, pressure, ignition delay. Dari ronning simulasi didapatkan
SFOC terkecil yang dibasilkan oleh kedua mesin yaitu pada kecepatan
3.87 rnls dimaoa pada mesin konveosional sebesar 370.54 glkWh dan
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pada linear engine sebesar 347.56 glk:Wh. Pada kecepatan 9.68 m/s,
mesin konvensional hanya mencapai daya sebesar 7.53 kW
sedangkan pada linear engine mencapai 9.45 kW. Torsi yang paling
besar yang dihasilkan oleh linear engine dan mesin
konvensional berada pada kecepatan 3.87 m/s, dimana pada sast
itu torsi yang dihasilkan oleh linear engine sebesar 26.37 N-m
Sedangkan pada mesin konvensional torque terbesar yang dihasilkan
sebesar 24,74 N-m. Mean effective pressure (MEP) yang dihasilkan
dari simulasi. Sast piston speed 3.87 m/s MEP dari linear engine berada
pada 6.25 bar sedangkan pada konvensional engine hanya 5.87 bar.
Kedua nilai MEP tersebut adalah yang tertinggi dari seluruh piston
speed. Tekauan tertinggi pada silinder le!jadi pada beban 100"/o (full
load), nilai tekanan tertinggi adalah 117.69 bar pada linear angle 2.283
mm. Meningkatnya piston speed mempengaruhi panjangnya igniton
delay pada mesin tetapi pembebanan terhadap mesin tidak begitu
berpengaruh pada panjangnya ignition delay. Dan heat release yang
le!jadi mempunyai nilai tetbesar adalah 0.0286 jlkg/LA le!jadi pada
linear angle 2.83 mm.
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Design of semi-free piston diesel engioe type two strokes, dual
opposed piston has been successfully carried out. Before developed of
the engioe is necessary to predict its performance. Prediction is done
using simulation methods. This method is considered the most
effective sioce an engioe yet builded Modeling and simulation
performed usiog software applications. Modeliog simulation covers
all parts of the engioe iotake system, block and iojection system, and
exhaust system. Predictions conducted based on the engioe
performance such as variable of speeds and loads. The model has been
validated trough the original design of conventional engioe. The
simulation is focusiog on engioe performance and combustion
process. The results bas been conducted that the smallest SFOC
generated by both the engioe is at a speed of 3.87 m I s in which io
conventinoal engioes of 370.54 g I kWh and the linear engioe of
347.56 glkWh. The power output at a speedof9.68 ml s, is 7.53 kW
for conventional engioe while the linear engioe reaches on 9.45 kW.
The greatest torque of both lioear and conventinoal engioe is at 3.87
m I s speed. In which of lioear engioe torque is 26.37 N -m. Whereas
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the torque of conventional engine on 24.74 N-m. The Mean Effective
Pressure (MEP) generated from the simulation; when the piston speed
of3.87 m/ s MEP oflinear engine is at 6.25 bar while the conventional
engine is 5.87 bar. The highest pressure in the cylinder occurs at I 00%
load (full load), the value of the highest pressure is 117.69 bar at 2.283
mm linear angle. Increased piston speed influences the length of
ignition delay but loading the engine but the machine did not affect the
length of ignition delay. The largest of heat release is 0.0286 J I kg
/LA at linear angle 2.83 mm.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSSP 621.437 Bim p |
| Uncontrolled Keywords: | Semi-free Piston Linear Engine, simulasi, performa, proses pembakaran, ignition delay |
| Subjects: | T Technology > TL Motor vehicles. Aeronautics. Astronautics > TL214 Automobiles--Motors--Pistons and piston rings. |
| Divisions: | Faculty of Marine Technology (MARTECH) > Marine Engineering > 36202-(S1) Undergraduate Thesis |
| Depositing User: | Mr. Tondo Indra Nyata |
| Date Deposited: | 21 Feb 2020 02:33 |
| Last Modified: | 21 Feb 2020 02:33 |
| URI: | http://repository.its.ac.id/id/eprint/75090 |
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